Water Well Journal
Issue link: http://read.dmtmag.com/i/573697
WWJ October 2015 63 Twitter @WaterWellJournl interrupting the surges is generally the preferred method. Although they are not extremely effective for all levels of high voltage protection, the use of "lightning arrestors" is nonetheless recommended for use in all deep well sub- mersible motor installation. In many cases, enhanced pro- tection is also warranted for high value or critical need installations as well. This can be in the form of specialized devices, designed for exactly this type of service. In most cases, a qualified electrical engineer can assist the installer with this need. 8. In addition to the motor protection issues discussed above, motor starting factors must also be evaluated. In former days, motor starting was largely limited to the use of "re- duced-voltage" type of starters that would reduce the in- coming voltage into the motor, thus reducing the starting current as well. These devices, which are largely still avail- able, include auto-transformer, part-winding (not applica- ble with submersible motors), and wye-resistor. Today, most of these former devices have been sup- planted through the use of solid-state starters and variable speed drives (VFDs). Although these newer devices will work on submersible motors comparably as they do with above-ground motors, it is still imperative the system designers evaluate and consider all potential operating conditions. This concludes this part of The Water Works. Here and in the last article we introduced and provided background for the two most popular and commonly used well pumps in the water service industry: vertical turbine pumps and sub- mersible pumps. In the next and last installment of this three-part series, we will introduce the hydraulic design applicable to both units and begin the actual design process. Until then, keep them pumping. WWJ Ed Butts, PE, CPI, is the chief engineer at 4B Engineering & Consulting, Salem, Oregon. He has more than 35 years experience in the water well business, specializing in engineering and business management. He can be reached at epbpe@juno.com. Learn How to Engineer Success for Your Business Engineering Your Business: A series of articles serving as a guide to the groundwater business is a compilation of works from long-time Water Well Journal columnist Ed Butts, PE, CPI. The hardback book features 37 complete "Engineering Your Business" columns and the figures and tables that originally ran with the articles. The columns cover the groundwater industry and are divided into six areas: contractor classroom, getting started, troubleshooting pumps, rehabilitation, business basics, and tricks of the trade. Visit NGWA's Online Bookstore at www.NGWA.org for more information. Y WH C T GE Y EXPERIENCE ABILITY D ? CERTIFIED KN EX ground national OSED CLD CL CERTIFI VC CV C OWLEDGE XPERIENCE association water ound OOP DRILLER L VERTICAL IED ® 800 551.7379 • www. protecting the resour Advance your career, .NGWA.org/Certificati rce. , your self-esteem, and on • 614 898.7791 d your paycheck while e